The reddish block-like crystals of waylandite with a coating of elongated greenish grains of kettnerite. From Waterloo Quarry, Dodge County, Wisconsin. Field of view is 0.5 mm left to right. (Dan Behnke specimen and image.)

Formula: BiAl3(PO4)2(OH)6 Hexagonal

Description: Waylandite is a dull to glassy white mineral that occurs rarely in pegmatites with other bismuth-bearing minerals.